The logarithmic Sobolev inequality along the Ricci flow
Abstract
Description
We derive a logarithmic Sobolev inequality along the Ricci flow without any restriction on time, which depends only on the initial metric via rudimentary geometric data, assuming only that a certain first eigenvalue is positive. As a consequence we obtain a uniform Sobolev inequality along the Ricci flow without any restriction on time. One application of it is a uniform kappa-noncollapsing estimate which holds true for all time. We also obtain similar results for bounded time without assuming the eigenvalue condition. The results extend to the Ricci flow with surgeries.
One appendix is added. A theorem on the Sobolev inequality along the Ricci flow with surgeries of Perelman is added. Two nonlocal Sobolev inequalities are also added. These results were obtained at the time of the posting of the first version of the paper. They were originally planned as parts of two upcoming papers of the author
One appendix is added. A theorem on the Sobolev inequality along the Ricci flow with surgeries of Perelman is added. Two nonlocal Sobolev inequalities are also added. These results were obtained at the time of the posting of the first version of the paper. They were originally planned as parts of two upcoming papers of the author